ABB RET670 - Measuring the Operating Limit of Set Values

Table 29: Test points for phase-to-ground C-G (Ohm/Loop)
Test point Reach Value Comments
1 X (2 x X1
set
+X0
set
)/3
R 0
2 X (2 x X1
set
+ X0
set
)/3
R 2 x R1
set
+ R0
set
)/3
3 X 0.8 x (2 x X1
set
+ X0
set
)/3
R 0.8 x (2 x R1
set
+ R0
set
)/3 +RFPG
set
4 X 0.5 x (2 x X1
set
+ R0
set
)/3
R 0.5 x (2 x R1
set
+R0
set
)/3 + RFPG
set
5 X 0.85 x RFPG
set
x tan(LdAngleset) LdAngle = angle for the maximal load
transfer
R 0.85 x RFPG
6 X RLdFwdset x tan(LdAngleSet)
R RLdFwd
set
7 X 0
R RLdFwd
set
8 X –02143 x RLdFwd
set
Exact: 0.8 x RFPEZx x tan (ArgDir=20°)
R 0.8 x RLdFwd
set
9 X –0.8 x RLdFw
set
x tan(ArgDir=20°)
–0.8 x RLdFwd
set
x tan(ArgDir=20°)
R 0.8 x RLdFwd
set
10 X 0.17 x (2 x X1
set
+ X0
set
) Exact: 0.5 x (2 x X1
set
X0
set
)/3
R -0.36 x (2 x X1
set
+ X0
set
) Exact: 0.5 x (2X1
set
+ X0
set
)/(3 x
tan(AgNegDir=30°)
11 X 0.27 x (2 x X1
set
+X0
set
) Exact: 0.8 x (2 x X1
set
+ X0
set
)/3
R –0.57 x (2 x X1
set
+ X0
set
) Exact: 0.8 x (2X1set + X0set)/(3 x
tan(AgNegDir=30°)
12 X 0.5 x (2 x X1
set
+ X0
set
)/3
R 0.5 x (2 x R1
set
+ R0
set
)/3
13 X 0
R RFPG
11.4.7.1 Measuring the operating limit of set values
Procedure:
1MRK 504 165-UUS - Section 11
Testing functionality by secondary injection
Transformer protection RET670 2.2 ANSI 135
Commissioning manual